690566 has 8 divisors (see below), whose sum is σ = 1039440. Its totient is φ = 344088.

The previous prime is 690553. The next prime is 690583. The reversal of 690566 is 665096.

690566 = 414² + 415² + ... + 417².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

690566 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620 + ... + 1328.

It is an arithmetic number, because the mean of its divisors is an integer number (129930).

2⁶⁹⁰⁵⁶⁶ is an apocalyptic number.

690566 is a deficient number, since it is larger than the sum of its proper divisors (348874).

690566 is a wasteful number, since it uses less digits than its factorization.

690566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1198.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 690566 is about 831.0030084181. The cubic root of 690566 is about 88.3897144111.

The spelling of 690566 in words is "six hundred ninety thousand, five hundred sixty-six".